The net interest margin (net interest income divided by average interest-earning assets) and the impact of acquisition accounting adjustments are summarized in the following table:

        Three Months Ended  
12/31/2012   12/31/2011   change   9/30/2012   change
Net interest margin, excluding effect of acquisition accounting adjustments 4.06 % 4.13 % (0.07 ) % 4.14 % (0.08 ) %
Acquisition accounting adjustments 0.55   0.39   0.16   0.65   (0.10 )
Reported net interest margin 4.61 % 4.52 % 0.09   % 4.79 % (0.18 ) %
 

Fourth quarter 2012 net interest margin was 4.61%, reflecting a 9 basis point improvement over fourth quarter 2011, largely attributable to the accretion of discounts on acquired loans. Excluding the effect of acquisition accounting adjustments, the core net interest margin for fourth quarter 2012 decreased 11 basis points from fourth quarter 2011 to 4.06%.

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